Revision: 16405
http://sourceforge.net/p/skim-app/code/16405
Author: hofman
Date: 2026-08-30 17:08:46 +0000 (Sun, 30 Aug 2026)
Log Message:
-----------
hidden prefereence for the white value (black) the white backgrouns is mapped
to when using inverted colors in dark mode. Value is in sRGB, mapped to
gamm=1.6 where we invert.
Modified Paths:
--------------
trunk/NSGraphics_SKExtensions.m
Modified: trunk/NSGraphics_SKExtensions.m
===================================================================
--- trunk/NSGraphics_SKExtensions.m 2026-08-12 14:47:26 UTC (rev 16404)
+++ trunk/NSGraphics_SKExtensions.m 2026-08-30 17:08:46 UTC (rev 16405)
@@ -184,6 +184,23 @@
#define LG 0.7152
#define LB 0.0722
+#define SKInvertedColorsBackgroundWhiteKey @"SKInvertedColorsBackgroundWhite"
+
+static CGFloat SKInvertedColorsBackgroundWhite() {
+ static CGFloat backgroundWhite = -2.0;
+ if (backgroundWhite < -1.0) {
+ NSNumber *bgw = [[NSUserDefaults standardUserDefaults]
objectForKey:SKInvertedColorsBackgroundWhiteKey];
+ if (bgw == nil) {
+ backgroundWhite = -1.0;
+ } else {
+ backgroundWhite = fmax(0.0, fmin(1.0, [bgw doubleValue]));
+ // map from sRGB to gamma=1.6 colorspace
+ backgroundWhite = backgroundWhite <= 0.04045 ? pow(backgroundWhite
/ 12.92, 0.625) : pow((backgroundWhite + 0.055) / 1.055, 1.5);
+ }
+ }
+ return backgroundWhite;
+}
+
NSArray *SKColorEffectFilters(void) {
NSMutableArray *filters = [NSMutableArray array];
CIFilter *filter;
@@ -200,7 +217,8 @@
}
if (SKHasDarkAppearance() && [sud boolForKey:SKInvertColorsInDarkModeKey])
{
// map the white page background to 45/255, or 30/255 with high
contrast
- CGFloat f = [[NSWorkspace sharedWorkspace]
accessibilityDisplayShouldIncreaseContrast] ? 1.9338 : 1.8972;
+ CGFloat bgw = SKInvertedColorsBackgroundWhite();
+ CGFloat f = bgw >= 0.0 ? 2.0 - bgw : [[NSWorkspace sharedWorkspace]
accessibilityDisplayShouldIncreaseContrast] ? 1.9338 : 1.8972;
CGFloat lrf = LR * f, lgf = LG * f, lbf = LB * f;
// This is like CIColorInvert + CIHueAdjust, modified to map white to
dark gray rather than black
// Inverts a linear luminocity with weights from the CIE standards
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